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^^^^^ Ponerjenktns. boseo on FRI daia 1 Un*, irv- - N-Heptane 165 kPa. Ar = 0 083 * 12 7 mm Kisler et al Air-Watet. ICO KPa A, = 0 107. <JH • 12 7 mm. h^ • SO 0 mm

Effect of other variables. Entrainment diminishes with sin increase in tray spacing (27,36,39,40,54) and increases with hole diameter (26,27,36,40,52-54). This hole diameter effect is large in the spray regime, and small in the froth regime (40). Entrainment generally increases as the fractional hole area is reduced, particularly when the dispersion is essentially in the form of a spray (23,27,36,38,52,53); however, when the dispersion is essentially frothy and the fractional hole area exceeds 10 percent, fractional hole area has little effect on entrainment (23,38,40,53). Entrainment shows a small dependence on weir height, with low weirs tending to cause more entrainment in the spray type of dispersions (38,40,53) and high weirs tending to cause more entrainment in the frothy type of dispersions (38,40,53,54). Entrainment diminishes with higher surface tension (39). A detailed analysis of the effects of tray geometry on entrainment is presented elsewhere (27,36,40).

Entrainment prediction. For spray regime entrainment, the Kister and Haas correlation (36) was shown to give good predictions to a wide commercial- and pilot-scale data bank. This correlation is

^^^^^ Ponerjenktns. boseo on FRI daia 1 Un*, irv- - N-Heptane 165 kPa. Ar = 0 083 * 12 7 mm Kisler et al Air-Watet. ICO KPa A, = 0 107. <JH • 12 7 mm. h^ • SO 0 mm

20 40 60 80 100 Liquid Flowrate L. M-1 H M Weir Lenglh

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